JP2002213524A - Vibration reducing device for plate material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily mountable vibration reducing device for a plate, having a simple, light and small-sized structure with a small number of components while having vibration damping effect expectable throughout a wide frequency range. SOLUTION: This vibration reducing device is mounted to a hole 6 provided in a plate material 5, and is equipped with an elastic body 2 in which a pair of large diameter parts 2a, 2b having larger diameter than the inner diameter of the hole 6 of the plate material 5 are mutually connected by a small diameter connecting part 2c and a circular recessed part 2d having a larger width than the plate thickness of the plate material 5 is formed between large diameter parts 2a, 2b, and a weight 3 supported by the elastic body 2. The circular recessed part 2d of the elastic body 2 is fitted in the hole 6 of the plate material 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing vibration of a plate material used in industrial machines such as automobiles, electric appliances and other building members.

[0002]

2. Description of the Related Art Conventionally, dynamic dampers and damping materials have been used to suppress vibration of a plate material.

FIG. 11 shows an example of a dynamic damper. A dynamic damper 01 has a weight 04 embedded in a bulging portion of an elastic body 03 baked on a mounting bracket 02. Screw the mounting bracket 02 of the dynamic damper 01 to the plate 05
06 fixed.

FIG. 12 shows an example of a vibration damping material.
A vibration damping material 011 made of an elastic material is adhered to the surface of.

[0005]

However, in the case of the dynamic damper 01, the number of parts is large, the mounting is troublesome, and the vibration damping effect for a plurality of resonances over a wide frequency range cannot be expected. It is difficult to suppress vibration with small amplitude.

In the case of the vibration damping material 010, the number of parts is small and the structure is simple. However, a large area is required for installing the vibration damping material 011 on the plate material 010, which limits the applicable range. 011 itself is heavy and, when applied to a vehicle or the like, hinders weight reduction.

[0007] The present invention has been made in view of such a point,
An object of the present invention is to provide a vibration reducing device for a plate material which can be expected to have a vibration damping effect over a wide frequency range which can be easily mounted with a simple and lightweight structure having a small number of parts.

[0008]

In order to achieve the above object, an invention according to claim 1 is a vibration reduction device attached to a hole provided in a plate material, wherein the vibration reduction device has a hole formed in the plate material. An elastic body in which a pair of large-diameter portions having an outer diameter larger than the inner diameter are connected to each other by a small-diameter connecting portion to form an annular concave portion having a width larger than the thickness of the plate material between the large-diameter portions; A weight supported by the elastic member, wherein the annular concave portion of the elastic body is fitted into the hole of the plate material to reduce the vibration of the plate material.

The vibration reducing device can be easily attached to the plate by elastically deforming one large-diameter portion and fitting the annular concave portion of the elastic body into the hole of the plate, and the elastic body supports the weight by a simple method. With a simple structure, the number of parts is small and downsizing and weight reduction can be easily achieved.

The elastic body of the vibration reducing device attached to the hole of the plate has a gap between the pair of large diameter portions and sandwiches the plate. A vibration damping effect is obtained based on the sliding friction when the large diameter portion collides with the plate material and the energy loss due to the collision when the large diameter portion collides with the plate material. Over a wide frequency range.

According to a second aspect of the present invention, in the vibration reducing device for a plate material according to the first aspect, a retaining member is provided on the elastic body.

Since the vibration reducing device is attached by fitting one of the large-diameter portions elastically and deforming the annular concave portion of the elastic member into the hole of the plate member, the vibration reducing device may fall out if it remains as it is. Stops are provided to prevent slipping out.

According to a third aspect of the present invention, in the apparatus for reducing vibration of a plate material according to the second aspect, an outer diameter of a weight provided at one large diameter portion of the elastic body is larger than an inner diameter of a hole of the plate material. At the end where the connecting rod extending from the weight penetrates through the small diameter connecting portion and the other large diameter portion, a retaining member having an outer diameter larger than the inner diameter of the hole of the plate material is attached to the exposed end to serve as the retaining. It is characterized by the following.

The large diameter portion where the weight is not provided is elastically deformed, the annular concave portion of the elastic body is fitted into the hole of the plate material, and the retaining member is attached to the end of the connecting rod extending from the weight.
Since a weight having an outer diameter larger than the hole and a retaining member are provided at both ends of the connecting rod penetrating the hole of the plate material, the vibration reducing device can be prevented from falling off. The connecting rod and the retaining member integrated with the weight can function as a weight as a whole.

According to a fourth aspect of the present invention, in the apparatus for reducing vibration of a plate member according to the second aspect, an outer diameter of a weight provided at one large diameter portion of the elastic body is larger than an inner diameter of a hole of the plate member. A through hole is provided to penetrate both the large diameter portion of the elastic body and the weight through the small diameter connecting portion, and a swelling portion having an outer diameter somewhat larger than the through hole is formed at one end and the other end is formed at the other end. An elastic body is formed by penetrating a pin provided with a retaining portion having an outer diameter larger than the inner diameter of the hole of the plate material from the side of the large diameter portion where the weight is not provided in the through hole with the bulging portion first. And the above-mentioned stopper is provided.

The large-diameter portion on which the weight is not provided is elastically deformed to fit the annular concave portion of the elastic body into the hole of the plate material, and the pin is inserted into the through-hole of the elastic body on the side of the large-diameter portion on which the weight is not provided. Since it is attached to the elastic body by penetrating with the bulging part first,
Since the mounting is easy and the swelling portion and the retaining portion are provided at both ends of the pin penetrating through the hole of the plate member, the vibration reduction device can be prevented from falling off.

According to a fifth aspect of the present invention, in the vibration reducing device for a plate material according to the first aspect, one of the pair of large diameter portions of the elastic body is larger than the other, and the two large diameter portions of the elastic body are connected with a small diameter. A through hole is provided through the portion, and the weight has a bulging portion having an outer diameter somewhat larger than the through hole at one end, and a stopper having an outer diameter larger than the inner diameter of the hole of the plate material at the other end. The elastic body is fitted into the hole of the plate material from the other smaller large-diameter part, and the weight is inserted into the through hole of the elastic body from the smaller large-diameter part side. It is characterized by being pierced and attached with the bulging portion first.

The elastic body is fitted into the hole of the plate by deformation of the smaller large-diameter portion, and the weight is inserted into the through-hole of the elastic body from the side of the smaller large-diameter portion with the bulging portion first. Therefore, since the bulging portion and the retaining portion are provided at both ends of the pin of the weight penetrating the hole of the plate material, the weight of the vibration reduction device can be prevented from falling off.

According to a sixth aspect of the present invention, there is provided a vibration reducing device attached to a hole provided in a plate member, wherein a pair of large diameter portions having an outer diameter larger than the inner diameter of the hole of the plate member are connected to each other by a small diameter connecting portion. An elastic body in which an annular concave portion having a width at least equal to the plate thickness of the plate material is formed between the large-diameter portions and a through-hole passing through both the large-diameter portions through the small-diameter connection portion is provided; A weight formed of a connecting rod provided with a bulging portion having an outer diameter somewhat larger than the through hole of the elastic body and having a retaining portion having an outer diameter larger than the inner diameter of the hole of the plate material at the other end, An annular concave portion of the elastic body is fitted into a hole of the plate material,
A vibration reducing device for a plate material in which the weight penetrates through the through-hole of the elastic body with the bulging portion first and is slidably supported in the penetrating direction with a gap in the elastic body.

An elastic body is fitted into a hole of the plate material, and a weight is slidably supported in the penetrating direction with a gap through a pin through a through hole of the elastic body fixed to the plate material. Therefore, the bulging portion and the retaining portion at both ends of the pin serve to prevent the weight from coming off, and at the time of vibration input, come into contact with the elastic body. A damping effect is obtained, and this kind of vibration damping effect covers a wide frequency range from a low frequency range to a high frequency range.

The vibration reducing device can be easily attached to the plate by elastically deforming one of the large-diameter portions to fit the annular concave portion of the elastic into the hole of the plate, and supporting the weight through the hole of the elastic. With a simple structure, the number of parts is small and the size and weight can be easily reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. In the present embodiment, the vibration reduction device 1 is applied to a floor panel 5 of an automobile body.

As shown in FIG. 1, the floor panel 5 is stretched and supported by a floor tunnel 7 and a body reinforcing member 8.
The vibration reduction device 1 is attached to a substantially central circular hole 6 of the floor panel 5.

FIG. 2 is a sectional view of a portion where the vibration reduction device 1 is mounted. The vibration reducing device 1 includes an elastic body 2 made of a rubber material and a weight 3. The elastic body 2 has a large-diameter portion 2 a having an outer diameter larger than the inner diameter of the circular hole 6 of the floor panel 5.
A pair of small-diameter connecting portions 2c having an outer diameter smaller than the inner diameter of the circular hole 6 are connected to each other.

The small-diameter connecting portion 2c is somewhat longer than the thickness of the floor panel 5, so that the elastic body 2 has large-diameter portions 2a, 2a.
An annular concave portion 2d having a width larger than the thickness of the floor panel 5 is formed between b. A disc-shaped weight 3 having an outer diameter larger than the inner diameter of the circular hole 6 is embedded in one large-diameter portion 2a.

When the vibration reducing device 1 as described above is mounted in the circular hole 6 of the floor panel 5, the large-diameter portion 2b of the elastic body 2 on which the weight 3 is not embedded is elastically deformed. 2 is easily fitted into the circular hole 6 so that the annular concave portion 2d is fitted into the circular hole 6.

As described above, in the vibration reducing device 1, the annular concave portion 2d of the elastic body 2 is fitted into the circular hole 6 and the upper and lower large-diameter portions 2a, 2a.
The movement is regulated by b, and attached to the floor panel 5.

Since the width of the annular recess 2d of the elastic body 2 is larger than the thickness of the floor panel 5, a gap C is formed between them.
The vibration reduction device 1 can be slid up and down with respect to the floor panel 5 by an amount corresponding to the clearance C.

At the time of vibration input, the elastic body 2 is displaced relative to the floor panel 5 together with the weight 3, and the large-diameter portions 2a and 2b contact the floor panel 5 as shown in FIG. The vibration damping effect as an impact damper based on the energy loss due to friction and collision is obtained.

The vibration damping effect of the impact damper extends over a wide frequency range from a low frequency range to a high frequency range. Particularly, a relatively low frequency vibration having a large amplitude (generally, a low order vibration of the elastic vibration of the panel itself). Functions as an impact damper (see FIG. 3). The vibration reduction device 1
Works as a vibration damping material for high-frequency, small-amplitude vibrations.

Further, with respect to vibration having a small amplitude of low frequency, as shown in FIG. 4, one large-diameter portion 2b restricted by the floor panel 5 is stretched by the elastic deformation of the small-diameter connecting portion 2c to the other large-diameter portion 2b. The large diameter portion 2a is displaced together with the weight 3 and functions as a dynamic damper to attenuate vibration.

As described above, the present vibration reduction device 1 can be easily mounted simply by fitting a hole in a plate material, thereby reducing the time and labor required for mounting and reducing the cost. Can be. Further, the vibration reducing device 1 itself is small and lightweight.

If the elastic body 2 has a sufficient mass, the elastic body 2 itself functions as a weight, and the vibration can be reduced even if there is no weight other than the elastic body. The structure becomes simple.

Next, a second embodiment will be described with reference to FIG. The vibration reducing device 21 according to the second embodiment includes an elastic member 22 substantially the same as the vibration damping device 1 according to the first embodiment.
And a weight 23, but a connecting rod 24 extending from the weight 23 penetrates the small-diameter connecting portion 22c and one of the large-diameter portions 22b to expose an end portion. Is attached by caulking or screwing.

When the vibration reducing device 21 with the retaining member 25 removed is fitted into the circular hole 28 from the large-diameter portion 22b where the weight 23 is not provided, the retaining member 25 is removed. 25 is attached to the tip of the connecting rod 24.

The retaining member 25 is a disk-shaped member having an outer diameter larger than the inner diameter of the circular hole 28. Both ends of the connecting rod 24 passing through the circular hole 28 of the panel 27 have an outer diameter larger than the circular hole 28. Weight
Since the stopper 23 and the retaining member 25 are provided, the vibration reduction device 1 can be prevented from falling off.

The vibration reducing device 21 functions as an impact damper or a dynamic damper according to the type of vibration as in the above-described embodiment, and has a damping effect on vibration over a wide frequency range. In the case of the present vibration reduction device 21, the connecting rod 24 and the retaining member 25 integrated with the weight 23 can function as a weight as a whole.

Since the vibration reducing device 21 has a structure for preventing falling off, it is suitable for a place where the acceleration of vibration is large such as an engine or a suspension.

Next, a third embodiment will be described with reference to FIGS. 6 and 7. FIG. Vibration reduction device 31 according to the third embodiment
As in the second embodiment, the elastic body 32 includes a pair of large-diameter portions 32a and 32b and a small-diameter connection portion 32c that connects the large-diameter portions 32a and 32b, and forms an annular recess 32d around the small-diameter connection portion 32c. However, the weight 33 buried in the large diameter portion 32a has an annular shape, and a through hole 32e penetrating both the large diameter portions 32a and 32b and the annular weight 33 through the small diameter connecting portion 32c is formed. (See FIG. 6).

The elastic body 32 can be fitted into the circular hole 38 of the panel 37 by elastically deforming the large-diameter portion 32b, and FIG. 6 shows the fitted state. On the other hand, as shown in FIG. 6, a central cylindrical portion 35a having an outer diameter at least equal to the inner diameter of the through hole 32e of the elastic body 32 is formed. A pin having a disc-shaped retaining portion 35c having an outer diameter larger than the inner diameter of the circular hole 38 is formed.
35 are available.

The pin 35 is made of resin or the like and is lightweight. The pin 35 is passed through the through hole 32 e of the elastic body 32 fitted in the circular hole 38 of the panel 37 from the side of the large diameter portion 32 b where the weight 33 is not embedded, with the tapered bulging portion 35 b leading first. 7 and attached to the elastic body 32 as shown in FIG.

As described above, the elastic member 32 is inserted into the circular hole 38 of the panel 37.
The vibration reduction device 31 can be mounted simply by inserting the pin 35 into the through hole 32e of the elastic body 32, so that the mounting operation is simple and the same vibration damping effect as in the above-described embodiment can be obtained.

Further, since the swelling portion 35b and the retaining portion 35c are provided at both ends of the pin 35 passing through the circular hole 38 of the panel 37, the pin 35 can prevent the vibration reduction device 31 from falling off.

Next, a vibration reducing device according to a fourth embodiment
41 is shown in FIG. The vibration reducing device 41 is similar in shape to the vibration reducing device 31 of the third embodiment, and
And weight 45. However, the small diameter connecting portion 42c of the elastic body 42
Large diameter portion of a pair of large diameter portions 42a and 42b
No weight is buried in 42a, and the large diameter portion 42a is larger and thicker than the other large diameter portion 42b.

The pin is made of steel instead of resin, and the pin itself constitutes the weight 45. The shape of the weight 45 is
A bulging portion 45b tapering at one end of the central cylindrical portion 45a in the same shape as 35;
A disc-shaped retaining portion 45c is formed at the other end.

As in the third embodiment, the panel 47
The elastic body 42 is fitted into the circular hole 48, and the weight 45 is inserted into the through hole of the elastic body 42 from the side of the smaller large-diameter portion 42b to the bulging portion 45b.
The vibration reduction device 41 can be easily attached as shown in FIG.

The bulging portion 45b and the retaining portion 45c at both ends of the weight 45 penetrating through the circular hole 48 of the panel 47 prevent the vibration reducing device 41 from falling off. And the retaining pin is the weight 41
Therefore, the structure is further simplified, the elastic body 42 is displaced integrally with the weight 41, and the elastic body 41 comes into contact with the panel 47, and a vibration damping effect as an impact damper is obtained.

Next, a vibration reducing device according to a fifth embodiment
51 is shown in FIG. The elastic body 52 of the vibration reduction device 51
The small-diameter connecting portion 52c connects a pair of large-diameter portions 52a, 52b having an outer diameter larger than the inner diameter of the circular hole 58 of the panel 57 to each other, and at least the thickness of the panel 57 is reduced between the large-diameter portions 52a, 52b. An annular recess of equal width is formed.

The large diameter portion 52a is larger and thicker than the other large diameter portion 52b. Both large diameter portions 52a, 52 of this elastic body 52
b is provided with a through-hole 52e that passes through the small-diameter connecting portion 52c.

When the elastic body 52 is fitted into the circular hole 58 of the panel 57 by elastically deforming the smaller large-diameter portion 52b and biting it, the width of the annular concave portion is at least equal to the thickness of the panel 57. As shown in FIG. 9, the elastic body 52 is fitted and fixed to the panel 57.

The weight 55, which is a pin having a tapered bulging portion 55b at one end and a disk-shaped retaining portion 55c at the other end, is small, as in the fourth embodiment. From the side of the larger diameter portion 52b, the tapered bulging portion 55b is passed first. The through hole 52e of the elastic body 52 is slightly larger than the outer diameter of the central cylindrical portion 55a of the weight 55, and has a gap C1 between the central cylindrical portion 55a and the inner surface of the through hole 52e.

The through hole 52 of the elastic body 52 through which the weight 55 penetrates
e has an inner diameter larger than the outer diameter of the central cylindrical portion 55a of the weight 55, and the width between the bulging portion 55b and the retaining portion 55c is an elastic material.
52 has a predetermined gap C2 which is somewhat larger than the entire thickness of 52.

Therefore, when the vibration is input, the panel 57 is
Vibrates together with the weight 52, and the weight 3
2, the bulging portion 55b and the retaining portion 55c come into contact with the elastic body 52, and the vibration damping effect as an impact damper based on the sliding friction and the energy loss due to the collision is obtained. In addition, with respect to low-frequency vibration having small amplitude, the elastic body 52 functions as a dynamic damper to attenuate the vibration by elastic deformation.

In the vibration reducing device 51, the elastic body 52 is fitted into the circular hole 58 of the panel 57, and the weight 55 is inserted into the through hole 52e of the elastic body 52.
Can be easily mounted simply by penetrating through, the time and labor for mounting can be reduced, the cost can be reduced, and the vibration reduction device 51 itself is small and lightweight. The weight 55 is prevented from falling off the elastic body 55 by the bulging portion 55b and the retaining portion 55c.

Next, FIG. 10 shows a vibration reduction device 61 according to a sixth embodiment, which is a modification of the fifth embodiment. The difference between the present vibration damping device 61 and the vibration reducing device 51 is that a through hole 62 e of an elastic
It is only the point that it touches and sandwiches the central column 65a of 65,
Other than this point, the vibration reducing device 51 is not different from the vibration reducing device 51, and is attached to the circular hole 68 of the panel 67 in the same manner.

Therefore, the vibration damping device 61 has substantially the same operation and effect as the vibration reduction device 51, and
The normal position of is determined.

In the above embodiment, the weight is made of steel, but the material is not limited to steel, and various materials having high density can be considered. The elastic body is made of rubber, resin, or an elastic foam containing the same as a main component, and is preferably made of high specific gravity rubber. The surface has a smooth flat or curved surface, but has an uneven shape. It may be.

[Brief description of the drawings]

FIG. 1 is a perspective view of a floor panel to which a vibration reduction device according to a first embodiment of the present invention is attached.

FIG. 2 is a sectional view of a portion to which the vibration reduction device is attached.

FIG. 3 is a sectional view showing a state at the time of vibration input.

FIG. 4 is a sectional view showing another state when a vibration is input.

FIG. 5 is a cross-sectional view illustrating a vibration reduction device according to a second embodiment.

FIG. 6 is an exploded cross-sectional view illustrating a vibration reduction device according to a third embodiment.

FIG. 7 is a sectional view showing an assembled state of the vibration reduction device.

FIG. 8 is a sectional view showing a vibration reduction device according to a fourth embodiment.

FIG. 9 is a cross-sectional view illustrating a vibration reduction device according to a fifth embodiment.

FIG. 10 is a cross-sectional view illustrating a vibration reduction device according to a sixth embodiment.

FIG. 11 is a diagram showing an example of a conventional dynamic damper.

FIG. 12 is a diagram showing an example of a conventional vibration damping material.

[Description of Signs] 1 ... vibration damping device, 2 ... elastic body, 3 ... weight, 5 ... floor panel, 6 ... circular hole, 7 ... floor tunnel, 8 ... body reinforcing member, 21 ... vibration damping device, 22 ... Elastic body, 23 ... weight, 24
... connecting rod, 25 ... retaining member, 27 ... panel, 28 ... circular hole, 31
… Vibration damping device, 32… elastic body, 33… weight, 35… pin, 37
... panel, 38 ... circular hole, 41 ... vibration damping device, 42 ... elastic body,
45… weight, 47… panel, 48… circle hole, 51… vibration damping device,
52: elastic body, 55: weight, 57: panel, 58: circular hole, 61: vibration damping device, 62: elastic body, 65: weight, 67: panel, 68 ...
Circular hole C: gap.

Claims (6)

[Claims] 1. A vibration reduction device attached to a hole provided in a plate material, wherein the large diameter portion is formed by connecting a pair of large diameter portions having an outer diameter larger than the inner diameter of the hole of the plate material to each other. An elastic body in which an annular concave portion having a width larger than the plate thickness of the plate material is formed; and a weight supported by the elastic body, wherein the annular concave portion of the elastic body is fitted into a hole of the plate material. A vibration reducing device for a plate material, characterized in that: 2. The apparatus for reducing vibration of a plate material according to claim 1, wherein a retaining member is provided on said elastic body. 3. An outer diameter of a weight provided on one of the large diameter portions of the elastic body is larger than an inner diameter of a hole of the plate material, and a connecting rod extending from the weight has a small diameter connecting portion and the other large diameter. 3. The vibration reducing device for a plate material according to claim 2, wherein a stopper member having an outer diameter larger than the inner diameter of the hole of the plate material is attached to an end portion exposed through the diameter portion to serve as the stopper. 4. An outer diameter of a weight provided on one of the large diameter portions of the elastic body is larger than an inner diameter of a hole of the plate material, and the two large diameter portions of the elastic body and the weight are connected to a small diameter connecting portion. A connection in which a through-hole passing through is provided, a bulging portion having an outer diameter somewhat larger than the through-hole is formed at one end, and a retaining portion having an outer diameter larger than the inner diameter of the hole of the plate material is provided at the other end. 3. The rod according to claim 2, wherein the rod is penetrated from the side of the large-diameter portion where the weight is not provided in the through-hole with the bulging portion first, and is attached to the elastic body to serve as the stopper. Plate material vibration reduction device. 5. One of a pair of large-diameter portions of the elastic body is larger than the other, a through-hole passing through both large-diameter portions of the elastic body through a small-diameter connection portion is provided, and the weight is provided at one end. A swelling portion having an outer diameter somewhat larger than the through hole is formed, and a connecting rod provided with a retaining portion having an outer diameter larger than the inner diameter of the hole of the plate material at the other end, wherein the elastic body is the other smaller one. The large-diameter portion is fitted into a hole of the plate material, and the weight is penetrated and attached to the through-hole of the elastic body from the smaller large-diameter portion side with the bulging portion first. Item 4. A vibration reducing device for a plate material according to Item 1. 6. A vibration reduction device attached to a hole provided in a plate material, wherein the large-diameter portion is formed by connecting a pair of large-diameter portions having an outer diameter larger than the inner diameter of the hole of the plate material to each other by a small-diameter connection portion. An elastic body between which an annular concave portion having a width at least equal to the thickness of the plate material is formed, and a through-hole passing through the both large-diameter portions through the small-diameter connecting portion; and a through-hole of the elastic body at one end. A weight formed of a connecting rod having a bulged portion having a somewhat larger outer diameter and having a retaining portion having an outer diameter larger than the inner diameter of the hole of the plate material at the other end; Is fitted in the hole of the plate material, and the weight is penetrated through the through hole of the elastic body with the bulging portion first, and is supported slidably in the penetrating direction with a gap in the elastic body. A vibration reducing device for a plate material, characterized in that: